Patents by Inventor Michael S. Marshak

Michael S. Marshak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Audio mixer/pre-amplifier
    Patent number: 4524452
    Abstract: An audio mixer for combining stereo phonograph, stereo high impedance and low impedance input signals having a means for audio previewing one or more of said inputs simultaneously including a means for visually indicating which signals are being previewed, further including a means for audio previewing said signals in a monophonic signal, further including a means for combining said inputs in the final amplifier stage such that the output signal is in a monophonic state, further including a means for disabling said low impedance input from the final output means.
    Type: Grant
    Filed: July 20, 1983
    Date of Patent: June 18, 1985
    Inventor: Michael S. Marshak
  • Front panel for a combined audio mixer and preamplifier or similar article
    Patent number: D280897
    Type: Grant
    Filed: September 15, 1983
    Date of Patent: October 8, 1985
    Inventor: Michael S. Marshak